CN111465764A

CN111465764A - Starter for internal combustion engine

Info

Publication number: CN111465764A
Application number: CN201880079817.9A
Authority: CN
Inventors: 木田润嗣; 小田原一浩
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-12-18
Filing date: 2018-03-29
Publication date: 2020-07-28
Anticipated expiration: 2038-03-29
Also published as: JP6407398B1; US20200248665A1; JP2019108829A; EP3730776A1; WO2019123671A1; US11181088B2; CN111465764B; EP3730776A4

Abstract

The object is to provide a starter for an internal combustion engine, which reduces noise at the time of starting. The starter of the internal combustion engine comprises a switch part (10), a motor part (20), a speed change mechanism part (30) and a pinion gear part (44), wherein the speed change mechanism part (30) is composed of a planetary gear device and a machine frame for accommodating the planetary gear device, the planetary gear mechanism is composed of a sun gear (31) connected with a rotating shaft of the motor part (20), a plurality of planetary gears (36) for transmitting the rotation of the sun gear (31) and an internal gear (37) for receiving the rotation of the planetary gears (36), an elastic element (38) is embedded between a protruding part (37a) formed on the outer peripheral surface of the internal gear (37) and a concave part (32a) for accommodating the protruding part (37a), and gaps (S1, S2, S3) are formed between the internal gear (37) and the machine frame through the elastic element (38).

Description

Starter for internal combustion engine

Technical Field

The present application relates to a starting apparatus for an internal combustion engine.

Background

Conventionally, in a starter for an internal combustion engine, a starter has been developed which can prevent a member for transmitting torque of the starter from being damaged by compression shock and decompression shock of the internal combustion engine at the time of starting. For example, in the starter disclosed in patent document 1, a shock absorbing member is provided in a speed change mechanism portion of the starter, so that a peak value of an impact force acting on the starter is attenuated to prevent the starter from being broken.

In the starter disclosed in patent document 2, a plurality of shock absorbing members having different elastic forces are used to absorb and alleviate a wide range of impact forces.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 59-23065

Patent document 2: japanese patent laid-open No. 61-61353

Disclosure of Invention

Technical problem to be solved by the invention

However, the starting devices for internal combustion engines of patent documents 1 and 2 have the following disadvantages: since the components of the speed change mechanism portion are unbalanced in accuracy and strength, they are deformed and eccentric by an impact force generated at the time of starting the internal combustion engine, and as a result, the casing of the starter motor collides with the components of the speed change mechanism portion, thereby reducing an impact reduction effect and generating an abnormal sound.

The present application discloses a technique for solving the above-described problems, and an object thereof is to provide a starter for an internal combustion engine, which can reduce the impact force generated when the internal combustion engine is started and reduce the noise at the time of starting.

Technical means for solving the technical problems

The application discloses a starting device of an internal combustion engine, comprising: a switch unit having a switch for moving the movable contact to close the fixed contact by energization; a motor unit that is energized and operated by closing the switch; a speed change mechanism portion that decelerates rotation of the motor portion; and a pinion gear portion having a pinion gear that moves in an axial direction by the operation of the switch portion, and an output of the speed change mechanism portion is transmitted to the pinion gear, the pinion gear portion meshes the pinion gear with a ring gear coupled to an internal combustion engine, it is characterized in that the speed change mechanism part is composed of a planetary gear device and a machine frame for accommodating the planetary gear device, wherein the planetary gear mechanism is composed of a sun gear, a plurality of planetary gears, and an internal gear, the sun gear is connected to a rotating shaft of the motor unit, the rotation of the sun gear is transmitted to the plurality of planetary gears, the internal gear receives the rotation of the plurality of planetary gears, an elastic member is fitted between a projection formed on the outer peripheral surface of the internal gear and a recess for accommodating the projection, and a gap is formed between the internal gear and the machine frame via the elastic member.

Effects of the invention

According to the starting device of the internal combustion engine disclosed in the present application, the elastic member is disposed between the internal gear of the speed change mechanism portion and the frame of the starting device, so that the impact force generated in the speed change mechanism portion at the time of starting can be alleviated, and the noise at the time of starting can be reduced.

Drawings

Fig. 1 is a partial sectional view showing a configuration of a starter of an internal combustion engine according to embodiment 1.

Fig. 2 is a main portion schematic view showing a cross section along a-a line in fig. 1.

Fig. 3 is a schematic diagram showing a structure of a main part in fig. 2 in an expanded manner.

Fig. 4 is a partial sectional view showing the structure of a starter of an internal combustion engine according to embodiment 2.

Fig. 5 is a main portion schematic view showing a cross section along a-a line in fig. 4.

Fig. 6 is a schematic diagram showing a structure of a main part in fig. 5 in an expanded manner.

Fig. 7 is a partial sectional view showing the structure of a starter for an internal combustion engine according to embodiment 3.

Fig. 8 is a main portion schematic view showing a cross section along a-a line in fig. 7.

Fig. 9 is a schematic diagram showing a structure of a main part in fig. 8 in an expanded manner.

Fig. 10 is a partial sectional view showing the structure of a starter for an internal combustion engine according to embodiment 4.

Fig. 11 is a main portion schematic view showing a cross section along a-a line in fig. 10.

Fig. 12 is a schematic view showing a structure of a main part in fig. 11 in an expanded manner.

Detailed Description

Embodiment mode 1

In the drawing, the starter 100 is a member for rotationally driving a ring gear 200 coupled to an internal combustion engine, and is composed of a switch unit 10, a motor unit 20, a transmission mechanism unit 30, and an output unit 40.

Here, the switching section 10 includes: a machine frame 11, in which the machine frame 11 is provided with a switch, which is composed of a solenoid, a fixed contact and a movable contact, not shown; a plunger 12, the plunger 12 being attracted by energization of the solenoid; and a handle 13, wherein the handle 13 is rotated by the plunger 12.

The motor unit 20 is a member that is energized to rotate by driving a shaft when the fixed contacts and the movable contacts of the switch unit 10 are closed, a yoke 21 is provided on the outer periphery of the motor unit 20, the yoke 21 forms a magnetic circuit and forms a frame of the starter 100, a partition wall 22 is provided at the axial front end of the yoke 21, and the partition wall 22 partitions the motor unit 20 and the transmission mechanism unit 30.

The output section 40 includes: an output shaft 41; a one-way clutch 43, the one-way clutch 43 being configured to be movable along the output shaft 41 via a spline 42 in accordance with rotation of the shank 13 and rotatably attached; a pinion gear 44 coupled to the one-way clutch 43, the pinion gear 44 moving in the axial direction together with the one-way clutch 43 to mesh with the ring gear 200; a bracket 46, the bracket 46 constituting a machine frame of the starter 100 and supporting a front end portion of the output shaft 41 via a bearing 45; and a stopper 47, the stopper 47 restricting the axial movement of the pinion gear 44.

The pinion gear 44 is disposed so as to be movable in the axial direction via the serration 44a, and is biased in the direction of the ring gear 200 by the elastic member 44 b.

Next, the transmission mechanism section 30, which is a main part of the starter in embodiment 1, will be described in detail.

Fig. 2 is a schematic view showing a main portion of a cross section taken along line a-a in fig. 1, and fig. 3 is a schematic view showing an expanded structure of the main portion in fig. 2.

As shown in the drawing, the speed change mechanism unit 30 is constituted by a planetary gear device, and is constituted to include: a sun gear 31, the sun gear 31 being formed at a front end of a rotation shaft of the motor unit 20; a bracket 32, the bracket 32 being attached to the bracket 46 and partitioning a space between the transmission mechanism unit 30 and the output unit 40; a flange 34, the flange 34 being rotatably supported by the bracket 32 via a bearing 33; a shaft 35, the shaft 35 being attached so as to project from the flange 34 in the axial direction; a plurality of planetary gears 36, the plurality of planetary gears 36 being rotatably attached to the shaft 35, and being engaged with the sun gear 31 to be driven to rotate; an internal gear 37, the internal gear 37 meshing with the planetary gears 36; and an elastic member 38, the elastic member 38 being inserted between the frame of the transmission mechanism portion 30 and the internal gear 37.

The frame of the transmission mechanism section 30 covering the planetary gear is constituted by a partition wall 22, a carrier 32, and a carrier 46, wherein the partition wall 22 separates the transmission mechanism section 30 from the motor section 20.

Here, a plurality of protrusions 37a are formed at equal intervals on the outer periphery of the internal gear 37, and the protrusions 37a are fitted into through holes 38a formed in the elastic member 38. Further, the holder 32 is provided with a recess 32a that holds the elastic member 38.

Therefore, the internal gear 37 is supported by the elastic member 38 such that an axial gap S1 is formed between the internal gear 37 and the partition wall 22, a radial gap S2 is formed between the internal gear 37 and the carrier 32, and a radial gap S3 is formed between the internal gear 37 and the carrier 46.

In fig. 3, illustration of the sun gear 31, the planetary gears 36, and the carrier 46 is omitted.

Next, the operation of the starting apparatus 100 for an internal combustion engine as described above will be described.

First, at the time of starting, when the solenoid of the switch unit 10 is energized, the plunger 12 is attracted and moved to the left side in fig. 1, and the lever 13 engaged with the plunger 12 is rotated. Accordingly, the one-way clutch 43 is pushed out to the right, and the pinion gear 44 abuts against the ring gear 200 with the elastic force of the elastic member 44 b.

Then, the movable contacts built in the switch unit 10 are connected to the fixed contacts, and when the motor unit 20 is energized, the pinion gear 44 slides on the tooth surface of the ring gear 200 while rotating, and the pinion gear 44 moves rightward to mesh with the ring gear 200. Further, the pinion gear 44 is locked by the stopper 47 so as not to move beyond the ring gear 200.

As a result, the rotational torque of the motor unit 20 is increased via the speed change mechanism unit 30, and is transmitted to the ring gear 200 via the output shaft 41 and the pinion gear 44, thereby starting the internal combustion engine.

However, although the speed change mechanism section 30 is displaced or deformed in the axis of the internal gear 37 due to the imbalance in the accuracy of the components and the imbalance in the forces acting on the components when the rotational torque of the motor section 20 is transmitted to the output section 40, the internal gear 37 is not hindered by providing the predetermined clearances S1, S2, and S3 between the internal gear 37 and the machine frame of the speed change mechanism section 30, and the internal gear 37 is supported by the machine frame of the speed change mechanism section 30 with the elastic member 38 interposed therebetween, so that the vibration generated in the speed change mechanism section 30 can be damped by the elastic member 38.

When Δ L is a movable range in the axial direction formed by the inclination, axial displacement, assembly interval, and the like of the ring gear 37 during operation, S1, which is a partition wall 22 of the machine frame of the transmission mechanism section 30, and the gap S1 in the axial direction between the carrier 32 and the ring gear 37, is set to S1 > Δ L, and when Δ R is a movable range in the radial direction caused by the deformation and eccentricity of the ring gear 37 (the movable range Δ R is collectively referred to as the interval of the gear), S2, which is a gap in the radial direction between the carrier 32 and the ring gear 37, and S3, which is a gap in the radial direction between the carrier 46 and the ring gear 37, are set to S2 > Δ R and S3 > Δ R.

As described above, by securing the axial gap S1, the radial gap S2, and the radial gap S3 between the casing of the variator unit 30 and the ring gear 37 by the elastic material 38, transmission of vibration to the casing of the variator unit 30 can be suppressed, and noise at the time of starting can be reduced.

Embodiment mode 2

Fig. 4 is a partial sectional view showing the structure of a starter of an internal combustion engine according to embodiment 2. Fig. 5 is a schematic view showing a main portion of a cross section taken along line a-a in fig. 4, and fig. 6 is a schematic view showing an expanded structure of the main portion in fig. 5.

In the drawings, the same or corresponding portions as those in embodiment 1 shown in fig. 1 to 3 are denoted by the same reference numerals, and description thereof is omitted.

In embodiment 1, the elastic member 38 is provided with a through hole 38a to accommodate the protrusion 37a of the internal gear 37, but in embodiment 2, a non-through hole 38b that closes the outer peripheral end of the hole of the elastic member 38 is provided, and a recess is configured to accommodate the protrusion 37a of the internal gear 37.

With this configuration, as in embodiment 1, vibration transmitted from the internal gear 37 to the frame of the transmission mechanism section 30 can be suppressed, and noise at the time of starting can be reduced.

In addition, the thickness in the radial direction of the bottom surface of the non-through hole 38b in the elastic member 38 may be smaller than the movable range Δ R of the internal gear 37, and in this case, since the protrusion 37a of the internal gear 37 does not directly abut on the inner peripheral surface of the carrier 32, the effect of reducing noise can be obtained as well.

Embodiment 3

Fig. 7 is a partial sectional view showing the configuration of a starter of an internal combustion engine according to embodiment 3, fig. 8 is a main portion schematic view showing a section along a line a-a in fig. 7, and fig. 9 is a schematic view showing an expanded configuration of a main portion in fig. 8.

In the drawings, the same or corresponding portions as those in embodiment 2 shown in fig. 4 to 6 are denoted by the same reference numerals, and description thereof is omitted.

In embodiment 2 described above, the non-through hole 38b is provided in the center portion of the elastic member 38 so as to accommodate the protrusion 37a of the internal gear 37, but in embodiment 3, the circumferential length of the side 38c of the elastic member 38 that receives the reaction force generated when the rotational torque is transmitted to the engine is formed to be greater than the circumferential length of the opposite side 38d of the elastic member 38 opposite to the side 38 c.

With this configuration, the torsional rigidity of the starter on the torque transmission side can be reduced, and thus, the impact during torque transmission can be reduced.

Embodiment 4

Fig. 10 is a partial sectional view showing the configuration of a starter of an internal combustion engine according to embodiment 4, fig. 11 is a main portion schematic view showing a section along a line a-a in fig. 10, and fig. 12 is a schematic view showing an expanded configuration of a main portion in fig. 11.

In the drawings, the same or corresponding portions as those in embodiment 2 shown in fig. 4 to 6 are denoted by the same reference numerals, and the description thereof is omitted.

In embodiment 4, the elastic member 38 is provided with the protruding portions 38e so as to sandwich both end surfaces in the axial direction of the internal gear 37, whereby the internal gear 37 can be reliably prevented from contacting the frame of the speed change mechanism portion 30 even when the internal gear 37 is inclined.

In addition, in embodiments 1 to 4, the description has been made of the starter of the internal combustion engine in which the protrusions 37a of the four ring gears 37 are provided at equal intervals, the elastic pieces 38 are fitted to the protrusions, and the three planetary gears 36 are provided, but the amount of deformation of the ring gears 37 during torque transmission can be reduced, and the gaps S1, S2, and S3 can be reduced, as long as the ring gears 37 and the planetary gears 36 are not each a multiple of the other number.

Even if the protrusions 37a of the internal gear 37 are arranged unevenly at unequal intervals, the amount of deformation of the internal gear 37 during torque transmission can be reduced in the same manner as described above.

In addition, although the present disclosure describes various exemplary embodiments and examples, various features, modes, and functions described in one or more embodiments are not limited to application to specific embodiments, and can be applied to embodiments alone or in various combinations.

Therefore, countless modifications not illustrated are assumed to be within the technical scope disclosed in the specification of the present application. For example, the case where at least one component is modified, added, or omitted is included, and the case where at least one component is extracted and combined with the components of the other embodiments is also included.

Industrial applicability of the invention

The starter of an internal combustion engine disclosed in the present application can alleviate the impact force generated in the transmission mechanism portion at the time of starting, and is useful for a vehicle or the like that seeks to reduce noise.

(symbol description)

10: a switch section;

20: a motor section;

22: a partition wall;

30: a speed change mechanism section;

40: an output section;

31 a pinion gear;

32: a support;

33: a bearing;

34: a flange;

35: a shaft;

36: a planetary gear;

37: an internal gear;

37 a: a protrusion portion;

38: an elastic member;

46: a support;

s1: an axial clearance;

s2: a radial gap;

s3: a radial gap.

Claims

1. A starting apparatus of an internal combustion engine, comprising:

a switch unit having a switch for moving the movable contact to close the fixed contact by energization;

a motor unit that is energized and operated by closing the switch;

a speed change mechanism portion that decelerates rotation of the motor portion; and

a pinion gear portion having a pinion gear that moves in an axial direction by operation of the switch portion and to which an output of the transmission mechanism portion is transmitted, the pinion gear portion meshing the pinion gear with a ring gear coupled to an internal combustion engine,

it is characterized in that the preparation method is characterized in that,

the speed change mechanism part is composed of a planetary gear device and a machine frame for accommodating the planetary gear device, wherein the planetary gear device is composed of a sun gear, a plurality of planetary gears and an internal gear, the sun gear is connected with a rotating shaft of the motor part, the rotation of the sun gear is transmitted to the plurality of planetary gears, the internal gear receives the rotation of the plurality of planetary gears,

an elastic member is fitted between a projection formed on the outer peripheral surface of the internal gear and a recess for accommodating the projection, and a gap is formed between the internal gear and the machine frame via the elastic member.

2. The starting apparatus of an internal combustion engine according to claim 1,

the clearance between the internal gear and the machine frame is formed by a clearance larger than that of the gear of the speed change mechanism.

3. The starting apparatus of an internal combustion engine according to claim 1 or 2,

a radial non-through hole is provided in the elastic member, and the protrusion of the internal gear is fitted in the non-through hole.

4. The starting apparatus of an internal combustion engine according to claim 3,

the radial thickness of the closed portion of the non-through hole in the elastic member is formed to be smaller than the clearance between the internal gear and the frame.

5. The starting apparatus of an internal combustion engine according to any one of claims 1 to 4,

the elastic member has a circumferential length on a side thereof receiving the reaction force of the internal gear, which is greater than a circumferential length of an opposite side thereof opposite to the side.

6. The starting apparatus of an internal combustion engine according to any one of claims 1 to 5,

a protruding portion that sandwiches an axial end surface of the internal gear is formed at the elastic member.

7. The starting apparatus of an internal combustion engine according to any one of claims 1 to 6,

the elastic member is disposed at three or more positions which are not multiples of the number of gears of the planetary gear.

8. The starting apparatus of an internal combustion engine according to claim 7,

the arrangement of the elastic members in the circumferential direction is made uneven.